Vulnerability Details CVE-2026-9693
Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 5.3%
CVSS Severity
CVSS v3 Score 3.5
References